Democratic U.S. Senate candidate Ned Lamont Thursday said his opponent, U.S. Sen. Joseph I. Lieberman, skipped almost 400 votes since 1999, including 33 of the 63 total votes taken on the Iraq war.

Earlier in the week, Lamont focused on a smaller slice of the senator’s Iraq war voting tallies, but expanded that Thursday to cover a seven-year period, the same amount of time Lieberman used almost two decades ago when he ran critical ads against then-incumbent Republican U.S. Sen. Lowell Weicker.

Lieberman won his first of three terms in the Senate in 1988 after beating Weicker. Lamont beat Lieberman last month for the Democratic nomination for the Senate and Lieberman is now running as a petitioning candidate.

"It is astonishing that Senator Lieberman has missed the same amount of votes that he criticized Weicker for, in half the time," Lamont said, which includes 25 percent of all votes in the Senate in the last 3-1/2 years.

Lieberman, in a conference call with reporters, said Lamont was "hypocritical" and "persistently negative."